Balancing device.



C. L'. LARSON.

BALANCING DEVICE.

APPLICATION FILED ram/2,1914.

1l46,62g9 Patented July 13, 1915.

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assiGNon or ONE-HALF 'ro NAI-TUM D. GODDARD, OF WORCESTER, MASSACHUSETTS.

' BALANCING nnvron.

Specification of Letters Patent. i

Patenten any aeg rais..

Application led May 2, 1914. Serial No. 836,008.

T0 all whom t may concern Be it known that l, CARL L. LAnsoN, a citizen ofy the United States, residing at Worcester, in the county of Worcester and State of Massachusetts, have invented a new and useful Balancing Device, of which the following is a specification.

This invention relates to a balancing device which, while capable of application to the balancing of rotary bodies in general, is especially adapted for balancing grinding wheels, pulleys, and the like. Although several devices have been invented for this general purpose', they usually involve the use of movable weights which are not easily adjusted or applied or in some cases have sev-l eral elements to adjust and most of them would also be inapplicable to polishing wheels for which this invention is particularly adapted.

The principal objects of this invention are to provide a balancing device for this purpose which shall be small and compact, easily adjusted, and which shall be capable of being reset very readily in case it gets out of adjustment.

Reference is to be had to the accompanying drawings, in which- Figure 1 is a side elevation of a grinding wheel supported for being balanced showing a preferred embodiment of this invention applied thereto; Fig. 2 is a central lon- -gitudinal sectional view of thesame on the line 2-2 of F ig. 1 on enlarged scale; Figs. 3 and 4 are side elevations of the two parts or elements of the balancing disk separated from each other; and Figsl and 6 are end elevations of the elements of the balancing disk.

.The invention is shown'as applied to a polishing wheel a mounted on a shaft b. Ordinarily a polishing wheel is balanced by fixing it to its shaft and placing the shaft on a pair of parallel tracks c. Then the position the wheel takes when allowed to move freely thereon is noted, and a small portion of the material of the wheel is removed on the heavy side. This operation, of course, has to be performed several times and so far as T am aware devices which have been invented for overcoming this difficulty are not in practical use in the balancing of polishing wheels.

ln using this invention 4the shaft 2i is placed on the parallel tracks c so that the shaft is free to roll thereon and the light slde of the wheel is provided with a radial mark 0.. Two disks 10 and 11 are connected with each other. The disk 10 is provided with a projecting hub 12 having a circumferentlal groove 13 therein, and the disk 11 is provided with a passage therethrough for receiving this hub. The latter disk is provided with a pin 14 projecting into the groove 13 when the two disks are assembled to hold the disks together rotatably. A spring 15 normally presses this pin in and a screw 16 holds it at the end. The disk 10 is provided with a central passage for the shaft of the grinding Vwheel so that the disks will be concentrically located with respect to each other and to the wheel. Tt will be noticed also that each of the disks is provided with a scale 17 on its circumference. These two scales are arranged to extend in opposite directions for a purpose which will appear hereinafter. ln addition to the pin 14: on the disk 11,the disk 10 is provided with pin 18 which can be forced in to engage the shaft and hold the disk thereon frictionally. This also has a spring and screw.

The operation of balancing the wheel is very simple. The two scales are turned so that the same numbers on the two scales register. For example, they may be set at first with the twos registering and these also set to register with the mark a on the wheel. Now if the wheel is allowed to rest freely by means of its shaft on the two parallel tracks it will be noted how the weight must be shifted in order to balance it. Then the two disks are turned so that some other numbers thereon register with each other.

The same' number is brought into registration with the mark. For example, the threes may be brought into this position. If it is then found that the eXtra balance is between these two points the disks can be vshifted back to any degree of iineness between the numbers 3 and 2. Then anut 19 is screwed up to secure the disks to the wheel. Thereafter the disks serve not only to keep the balance but perform the usual function of a washer. Preferably the scales are so set that when the two zeros register the two weighted sides of the disks balance each other. lt will be understood that it is not absolutely necessary to manipulate the disks in this way, but if the scales are maforation therethrough fitting the hub of nipulated as stated, there will be only one number for the operator to remember if he takes the Wheel olf the scale on which it is j balanced, and places it on the shaft on which it is to run. When that is done, the disks are put back to the same marks and the nut 19 screwed up. It Will be seen, therefore, that the adjustment is extremely simple; and that the placing of the parts back in their adjusted position in case the adjustment is lost is greatly facilitated. lt Will be observed further that the adjustment can be made in a minimum of time by an ordinary Workman Without trouble. Moreover, the device is particularly adapted for polishing `Wheels and similar rotatable bodies, and there is no likelihood of its getting out of adjustment in operation after it is once adjusted to the Wheel. The parts are all simple to manufacture, and contain no features likely to get out oforder in practice. Although l have illustrated and described only a simple embodiment of the invention, I am'avvare of the fact that many modiications can be made therein by any person skilled in the art Without departing from the scope of the invention as expressed in the claims. Therefore I do not Wish tobe limited to all the detailsof ,construction herein shown and described, but

What l do claim is z y1. As an article of manufacture, a balancing device for balancing a rotary body, said balancing device comprisinga pair of disks, one rotatably connected with the other and adapted to be applied to the shaft of the rotary body, and both capable of being turned independently of each other, said disks each having a relatively iXed light side and heavy side, whereby said disks can be turnedrelatively to each other and to the rotary body for balancing the latter.

2. As an article of manufacture, a. balancing device for a rotary body, comprising a disk having a central perforation therethrough and a hub having a circumferential groove, means by which the disk can be held frictionally on the shaft of the body to be rotated, a second disk having a perthe first disk and means for entering said groove and holding the second disk on the first disk, each of said disks having a relatively heavy and light side, whereby said disks can be turned relatively to each other and to the body to be balanced for balancing the same.

3. As an article of manufacture, a balancing device comprising a pair of disks. one rotatably mounted on the other and both adapted 'to be applied to a shaft so as to turn with respect thereto, said disks each having a light side and a heavy side, Whereby said disks can be turned' relatively to each other and to the rotary body to be balanced, each of said disks having a scale thereon, said scales extending in opposite vdirections on the two disks.

4. |The combination with a rotary body to be balanced and a shaft therefor, of a balancing device comprising a pair of disks, one rotatably mounted 'on the other and both applied to said shaft so as to turn with respect thereto, said disks each having a f light side and a heavy side, whereby said disks can be turned relatively to each` other and to the rotary body to balance the latter, and means for securing one disk on the other, and said other disk on the shaft.

5. As an article of manufacture, a balancing device for balancing a rotary body, said balancing device comprising a pair of disks,

vone rotatably connected with the other and witnesses. v

CARL L. LARSON.

Witnesses:

N. D. GoDDAnn, C. Fonnns'r WEssoN. 

